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net/http: invalid header field name "js.fetch:mode" #34157

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@rudolph9

Description

@rudolph9

What version of Go are you using (go version)?

$ go version
go version go1.12.8 linux/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/username/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/username/.golang"
GOPROXY=""
GORACE=""
GOROOT="/usr/lib/go-1.12"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go-1.12/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/username/project/path/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build680907567=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Attempted add the header "js.fetch:mode" so my code will work correctly in a wasm target.

However, now the amd64 target through the error:
net/http: invalid header field name "js.fetch:mode"

What did you expect to see?

it to just ignore the header

What did you see instead?

an error

Other comments

What is the best practice for handling code that is intended to support multiple build targets?

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